The Wolfhunter DLC for Bethesda's The Elder Scrolls Online will be arriving to PC on August 13, 2018, bringing along a couple of new expansive dungeons. We already got a glimpse of the first dungeon, March of Sacrifices, and now we can check out a detailed preview for Moon Hunter Keep, the second one. Here's an excerpt:

THE STRONGHOLD HAS FALLEN

Situated in northern Reaper’s March, Moon Hunter Keep served for years as a base of operations for the werewolf hunters known as the Order of the Silver Dawn. Heavily fortified both inside and out, at first glance, the stronghold appears impregnable to assault. However, the unthinkable has happened, and the very beasts the Order has sworn to destroy have managed to infiltrate the keep and overwhelm its defenders.

For the Order, this is not just a loss of one of their key strongholds, but a complete and demoralizing defeat.

“Moon Hunter Keep was the central location where the Silver Dawn operated in Reaper’s March. From there, they would coordinate their movements and activities across the entire region,” explains Mike Finnigan, ESO’s Dungeon Lead. “This loss dealt a blow to the organization and their ability to respond to threats in the surrounding areas, but, more importantly, it’s also a symbolic defeat in that the very creatures they hunt have now taken over their bastion.”

Anybody familiar with the keeps and fortifications of Cyrodiil will recognize the tall walls and strong gates of the garrison.

“With this new dungeon, we really wanted to sell the idea that this was a keep with a specific purpose,” says Finnigan. “We wanted its sections to be clearly defined, from the initial holding pens and cells to the library and eventually the overlook.”

Now, the ancient werewolf known as Vykosa controls Moon Hunter Keep, and from her new base of operations, she has begun to draw her fellow lycanthropes to her cause. You and your team must mount your own assault on the keep, expel the werewolf invaders, and put a stop to Vykosa’s insidious plans.

[...]

RAID AND PLUNDER

When you brave the halls of Moon Hunter Keep and liberate the fortress from the clutches of Vykosa, you and your team will find ample rewards for your efforts.

In addition to unique Trophy and Bust collectibles that are awarded for completing the dungeon on Normal and Veteran difficulties, you can also earn the Sable Man-Beast skin when you complete the “Moon Hunter Keep Challenger” achievement. This new skin will ensure everybody knows that within your character beats the heart of a wild beast!

Moon Hunter Keep also features three new unique armor sets that are themed to the monsters that you just vanquished. For example, the Savage Werewolf set allows your Light and Heavy attacks to cause your enemy to bleed for considerable Physical Damage, making your transformed werewolf attacks even more vicious.

Finally, this new dungeon also offers a new Monster Mask. The Vykosa mask, when coupled with the shoulders acquired from Urgarlag Chief-bane’s Undaunted Chest, increases your healing taken and applies Major Maim to a taunted enemy, allowing a tank to better manage an enemy’s damage output.

On top of that, you can also read this article that lists five ways to prepare for the upcoming DLC. For example:

RECEIVE HIRCINE’S BLESSING

If you can’t beat ‘em… why not experience the new dungeons through the eyes of the beasts themselves? There are two ways you can become a lycanthrope in The Elder Scrolls Online: by picking up the Werewolf Skill Line from the in-game Crown Store (located in the Utility section) or by being bitten by one of the beasts.

To receive a bite and contract Saines Lupinus, find and be hit by one of the rare werewolves in Bangkorai, the Rift, or Reaper’s March. Note that these special beasts can only spawn at specific times. Alternatively, you can ask a player who already bears the curse and the Bloodmoon Passive Ability to bite you.

Once you receive the curse, you’ll unlock the quest titled “Hircine’s Gift”. Complete the quest to fully become one of the Daedric Prince’s werewolves. With Wolfhunter and Update 19, the Werewolf Skill Line has been completely reworked, meaning there’s never been a better time to unleash the beast within.